@bahaamohamadi
Active 4 months, 3 weeks ago-
stevexu started the topic GCP selection problems in the forum Sarproz Forum 9 years ago
There is a problem of selection GCP in my test scenario. Problem lies the GCP can not be picked up by “date cursor” or ginput command in the reflection map. If use the “data cursor”, an random position is located. And ginput got no response.
Help me out, badly for the next step. -
periz replied to the topic TSX Stripmap data in the forum Sarproz Forum 9 years, 1 month ago
Sarproz ingests SLC (Single Look Complex) data.
You should check the TSX data sheet.
I am afraid you are ordering the wrong product (multi-looked) -
periz replied to the topic some questions about SPP in the forum Sarproz Forum 9 years, 1 month ago
Hi cnuhyl,
the infos you are providing are too few to understand your case.
First of all, in the PSC selection there is also a sparsing operation applied (points are made sparser according to the DS and DL values). You should check it.
Secondly, I am wondering whether your overwrote the coherence file.
To understand better, I suggest you load the…[Read more] -
cnuhyl started the topic some questions about SPP in the forum Sarproz Forum 9 years, 1 month ago
Hi
In First SPP analysis I select 570967 PS point.
In second APS analysis I select PS point with Temporal Coherence bigger than 0.7 and select 33392 PS point
In second SPP analysis I set the Temporal coherence equal 0,but only select 33392 PS point????
Why? The number of PS point is so small???More information in the attachment. Thank…[Read more]
-
gemma started the topic TSX Stripmap data in the forum Sarproz Forum 9 years, 1 month ago
Hello All,
I am about to order some TSX Stripmap data and I was wondering to check some items that you should define before ordering any image. Here I listed them as I thought it might be compatible with SARPROZ processing package:
1. Processing Level : L1B
2. Resolution Variant : Spatially Enhanced
3. Geocoded Incidence Angle Map: No
4.…[Read more] -
periz replied to the topic Failed to satisfy constraints for Composite construction in the forum Sarproz Forum 9 years, 1 month ago
Hi Matus,
if you are running 2 instances of Matlab together, one instance may have opened a pool of workers exhausting your resources.
So, if the second instance opens a spmd process, it will return an error because no resources are available.
You can solve this issue by halving the number of workers for both instances.
Say that you have totally…[Read more] -
matusbakon started the topic Failed to satisfy constraints for Composite construction in the forum Sarproz Forum 9 years, 1 month ago
Hi, while using Site processing/Sub-dataset extraction function I get:
“Failed to satisfy constraints for Composite construction.”
to what problem is this error referring to? I am running 2 instances of SARproZ on the same computer. -
periz replied to the topic MST in the forum Sarproz Forum 9 years, 2 months ago
If you are processing PS-like targets, use the star graph.
If you are dealing with distributed targets, it’s better to use a multi-master graph.
The MST is theoretically interesting, but practically it’s better to use more connections to stabilize the inversion.
If you use the (spatial) coherence as weight, it’s strongly suggested to use a…[Read more] -
Yuxiao started the topic MST in the forum Sarproz Forum 9 years, 2 months ago
Hi there’s one question.
I know that you advice against using MST connection in PS analysis all the time. Even when using QPS you suggested using star graph.
My question is that: is there any kind of circumstances, that using MST is preferred? Or, in other words, MST could possibly give a better result than star-graph?
I believe not, though..
yuxiao
-
periz replied to the topic velocity standard deviations in the forum Sarproz Forum 9 years, 2 months ago
Hi Ivana
at this moment this calculation is not published.
The std dev in the paper mentioned by you is a statistical quantity.
The one listed in the sarproz output is a value calculated for that single time series.
The point is: the solution of the estimation is found as the peak of the periodogram.
How sharp is the peak? If the movement is…[Read more] -
ivca-cz replied to the topic velocity standard deviations in the forum Sarproz Forum 9 years, 2 months ago
Hello Daniele,
I am getting slowly into it.
I understand there are two standard deviations – one evaluated from the coherence, using e.g. Colesanti 2003, and the other one evaluated here (can you recommend a paper where to read more?)
I understand it is a measure by which the variable (velocity, height) could change with no (significant) change…[Read more]
-
periz replied to the topic velocity standard deviations in the forum Sarproz Forum 9 years, 2 months ago
Hi Ivana,
some comments:
a. the standard deviation of the velocity is a measure of the peak width of the periodogram. It’s not a global parameter as the temporal coherence, it’s local (giving a view around the estimated parameter).
b. if it would simply be correlated to the coherence, it would not be useful. By already having the coherence, you…[Read more] -
ivca-cz replied to the topic velocity standard deviations in the forum Sarproz Forum 9 years, 2 months ago
ok, as the csv could not be attached, i am putting some lines from the file:
VEL SIGMA VEL KTEMP CUM…[Read more]
-
ivca-cz started the topic velocity standard deviations in the forum Sarproz Forum 9 years, 2 months ago
Hello,
For the first time, I am looking at velocity standard deviations.
With a coherence of 0.88, the velocity standard deviation is 1.4 mm/y, and with a coherence of 0.46, the estimated velocity standard deviation is 1.7 mm/y (velocity 18 mm/y). Is this right, having a set of 33 scenes? I am (hopefully) attaching the CSV.
-
periz replied to the topic where to find the average rate of each year in the forum Sarproz Forum 9 years, 2 months ago
sorry, you are right.
The cumulative displacement is calculated using the model you chose for the time series analysis.
This reduces possible noise. -
seppi-santiago replied to the topic where to find the average rate of each year in the forum Sarproz Forum 9 years, 2 months ago
Then, the cumulative displacement shouldn’t be equal to the displacement for the last acquisition?
I give you a concrete example:
20120803 (First Acquisition): 0.00
20120819: 0.43
.
.
.
20150112 (Last Acquisition): -14.53 —-> This is the displacement of 20151212 respect to 20120803??
CUMULDISP: -15.54 -
periz replied to the topic where to find the average rate of each year in the forum Sarproz Forum 9 years, 2 months ago
The time series in the site processing are referred to the first acquisition.
In the small area processing you can choose whether to refer them to the first acquisition or to the Master one.
However the Master acquisition may be noisy, so, the sw estimates an error and it removes it (so, the value at the master may be not zero).
The cumulative…[Read more] -
seppi-santiago replied to the topic where to find the average rate of each year in the forum Sarproz Forum 9 years, 2 months ago
Hello Daniele,
I have a doubt regarding the fields YYYYMMDD (created with the time series option) which seem to be showing displacement values. These values refer to a cumulative displacement (i.e. the cumulative displacement at date 20010721) or to the single displacement registered for that acquisition (in that case, respec to to whom or when?…[Read more]
-
periz replied to the topic cumulative displacement isn't accuarte in the forum Sarproz Forum 9 years, 2 months ago
yes, that is something to be tided up.
Initially, the Cum Disp tool was generated to calculate it based on the estimated coefficients of a polynomial.
Later on, I invented the smart tool, which is a non-parametric time series analysis.
So, the Cum Disp tool is consistent with the rest of the results (and it calculates the proper things) only if…[Read more] - Load More